Mar. x 7 ,1923 Influence of Soil Temperature on Seedling-Blight 869 
about 12 0 C., in both constant soil temperature and mean daily field soil 
temperature. The critical soil temperature for the seedling-blight of 
corn is between 20° and 24 0 under both greenhouse and field conditions. 
( x 3) Infection takes place and the blight progresses, then, at entirely 
different temperatures with the two different hosts, wheat and corn, 
inoculated with the same parasite. Hence, the influence of environ¬ 
mental factors on the hosts seems to be the fundamental cause of suscep¬ 
tibility to the disease. The seedlings become susceptible when they are 
unable to respond favorably to the environment. 
f t LITERATURE CITED 
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(2) Appel, Otto, and GassnEr, Gustav. 
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(3) Arthur, J. C. 
1891. wheat scab. In Ind. Agr. Exp. Sta. Bui. 36, p. 129-132. 
(4) Atanasoff, Dimitr. 
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(5) Bialoblocki, J. 
1871. UEBER DEN EINFLUSS DER BODENWARME AUF DIE ENTWICKLUNG EINIGER 
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(6) BollEy, H. L. 
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(7) —• 
1913. WHEAT: SOIL troubles AND SEED deterioration, causes of soil 
SICKNESS IN WHEAT LANDS; POSSIBLE METHODS OF CONTROL; CROP¬ 
PING METHODS with wheat. N. Dak. Agr. Exp. Sta. Bui. 107, 96 
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(8) Chester, Frederick D. 
1891. THE SCAB OF WHEAT. FUSARIUM CULMORUM, W. SM. In Del. Agr. 
Exp. Sta. 3rd Rpt., 1889/90, p. 89-90. 
(9) Dickson, James G., and Johann, Helen. 
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(10) Duggar, B. M. 
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( 11) Gilman, Joseph C. 
1916. CABBAGE YELLOWS AND THE RELATION OF TEMPERATURE TO ITS OCCUR¬ 
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Literature cited, p. 78-81. 
(12) GutzEit, Ernst. 
1908. VERSUCHE Cber das schossen der rCben und anderer pflanzen. 
In Mitt. K. Biol. Anst. Land. u. Forstw., Heft 6, p. 20-23, 1 fig. 
(13) Haberlandt, Friedrich. 
1874. DIE OBEREN UND UNTEREN temperaturgrenzen Ft)R die keimung 
DER WICHTIGEREN LANDWIRTSCHAFTLICHEN SAmEREIEN. In Landw. 
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(14) -. 
1878-79. DER ALLGEMEINE LANDWIRTHSCHAFTUCHE PFLANZENBAU . . . 
NACH DEM TODE DES VERFASSERS HERAUSGEGEBEN VON W. HECKE. 
x, 760 p. Wien. 
1879. ALLGEMEINE LANDWIRTSCHAFTLICHEN PFLANGENBAU WElN, p. 39-47, 
(15) Halsted, Ifyron D., and Waksman, Selman A. 
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